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Ships within 48 hours · Estimated delivery Aug 16 - Aug 21
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scratch and water resistant with a great weight and feel
Ours shares the name and the fun of dropping a coin
Small enough for a desk
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Napier's Bones | Handmade Wooden Math STEM Teaching Aid family game night be/XqzhXJLaKNcNapier's Bones is a handcrafted wooden reproduction of the multiplication aid invented by John Napier in 1617. Before calculators, students and tradespeople used the marked rods to multiply, divide, and find roots. The base set ships with two complete sets of rods (0 9), a storage base, a wood cover, and printed instructions with worked examples. Optional square root or cube root bone add ons at checkout. Includes: storage base, 2 sets of rods 0 9,
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